Carburetor



Nov. 14, 1933.

W. F. BROGE CARBURETQR Filedprir 5, 1932 2 sheets-sheet 1 @www PatentedNov. 14, 1933 UNITED STATES PATENT oF'FrcE 6 Claims.

The present invention relates to improvements -in carburetors designedparticularly for using gasoline and other high grade fuel.

One of the important objects of the present invention is to provide acarburetor wherein 'the use of the usual oat chamber and associatedmechanism is dispensed with.

Another object is to provide a carburetor of a simple and compactconstruction, eiiicient in operation, inexpensive to manufacture andassemble and otherwise well adapted for the purpose for which the sameis intended.

Other objects and advantages reside in the special details ofconstruction and operation as more fully hereinafter described andclaimed in the following specication and illustrated in the accompanyingdrawings forming part hereof, wherein the reference numerals designatecorresponding parts throughout and in which Figure l is a irontelevational view,

Figure 2 is a side elevational view showing the throttle valve,

Figure 3 is a. vertical sectional view taken on a line 3--3 of Figure l,

Figure d is a side elevational view showing the choke valve,

Figure .5 is a perspective view of the arcuate plate valve and shaft,

Figure 6 is a sectional view through the throttle valve housing,

Figure 7 is a detail of the pivoted connection for the adjusting screwof the throttle valve, and

Figure t is a detail ofthe adjusting screw.

Referring to the drawings in detail, wherein I have shown a preferredembodiment of my invention, the numeral 5 designates a casing generally,open at each end and having its walls at right angles. Threaded bosses 6are formed adjacent each open end to either of which may be attached ahanged throat 'l for attaching the casing to an engine intake manifold.The opposite end constitutes an air intake andmay be provided with anyconventional air-lter (not'shown), if desired.

A shalt B is positioned transversely in the casing with its endsjournalled in openings in the walls 9 and projecting outwardly fromopposite sides. Mounted on the shaft within the casing is a sleeve 10 towhich an arcuate plate valve 11 is welded or otherwise ilxedly secured,the plate having -its axis longitudinally of the shaft and eccentricallypositioned withrespect to the shaft, the end edges of the plate beingtted closely against the side walls 9. A baffle plate 12 is disposed inthe casing having one edge disposed in wiping engagement with the shaftand with its opposite edge inclined toward and abutting the rear wall13'. A threaded lug 1'4 is carried by the plate 12 for receivinga screw14 for attaching to the rear wall. The side edges of the baie plate abutthe side walls 9 so that air entering the casing is directed toward thefront wall 15 for passing around the front edge 16 of the arcuate platevalve-11. y

The lug 14 also constitutes a. stop for the rear edge of the arcuateplate valve to limit its movement in one direction.

The front wall 15 is removably secured in position by threaded bolts 17,dowels 18 serving to align the edges of. the front and side walls. Thefrontl wall is provided with two rows of openings 19 and 20 disposedparallel to the axis ol the shaft, the openings lil being positioned forclosing by the arcuate plate valve li when the faceadiacent the frontedge 16 is moved against the front wall and when therear edge ci theplate engages the stop 14, as shown in Figure 3 oi' the wir When theshaft is rotated to disengage the rear edge oi. the plate from. the stopit will be apparent the iront edge will gradas ally move away from theiront wall to allow air to be sucked through the casing and pull iuelthrough the openings 12, said openings having a suitable connection witha fuel feed pipe as morefully hereinafter explained. rlhe openings 2care at all times out of engagement by the plate valve 11 and positionedintermediate the valve and the throat 7.,

The bolts 17 also serve to attach a plate 21 to the outer side of thefront wall l5, the inner lace of the plate having a pair of parallelgrooves 22 and 23 communicating respectively' with the rows of openings19 and 20, each of the grooves having one end extending to an oppositeedge oi the plate 21.. gg

To one side of the casing is secured a tubular valve housing 24, open ateach end and provided with a lthreaded screw 25 in one end, the screwhaving la, tapered recess 25' in its inner end forms ing a seat for thetapered end 26 of a needle valve 27 reciprocally mounted in the housing.

A shoulder 28 is formed on the valve cooperating with a seat 29 in thehousing to control passage of fuel through passages 30 and 31 extendinglaterally through opposite sides of the housing and positionedrespectively below and above the seat 29` `The passage '30 communicatving with a threaded nipple 32 for attaching a pipe line leading to afuel tank (not shown). A ball check valve 33 is also positioned in thenipple 32. 110

l pivotally attached thereto.V The link extends v formed on the casing.

' in an annular groove 38 parallel to the needle valve and is providedwith an apertured yoke 35 at `its fopposite end in the openings of whichis pivoted trunnions 36 formed on a block 37. An opening is formed inthe block an adjusting screw 38v for receiving one end of threadedthrough a boss 39 on one side of a throttle lever 30. A locking screw 41is seated of the adjusting screw 38 for securing the latter againstmovement in the .block 37.

The lever has a split opening for adjustably mounting on one end of theshaft 8, the split endsy 42 being secured in a clamped position on theshaft by a screw 43. To the opposite wall of the casing is attached atubular valve housing 44, open at each end, and

with a fuel feed pipe 45 attached to one end,4

said pipe also having a ball check valve (not shown) therein. A needlevalve 46 is reciprocally mounted in the housing with one end projectingtherefrom and slidable in a guide 47 The internal construction of thehousing 44 and valves 46 -is substantially the same as that of thehousing 24 and valve 27 and a further' detailed description of the sameis therefore believed unnecessary. The housing 44 has a lateral passage48 which registers with the groove 23 of.

the plate 21 for feeding fuel through the row of openings 20 of thecasing. A collar 49 is secured to the outer end of the valve 46 and towhich is pivotally attached one 'end of a link 50, the opposite end ofthe link being pivoted to a -choke lever 51, the latter being pivotallyattached to a pin 5'2 projecting from LFE ` operation of the lever 51.

the housing 44. A coil spring 53 is mounted on the valve between theguide 47 and collar 49 for normally urging the valve into a closedposi-- tion. A lug 54 is provided with a split opening for adjustablemounting onthe end of the shaft 8 adjacent the housing 44, the split end55 being secured in clamped position by a screw 56. An

extension 57 constituting a 'cam is formed on the lug for engagement byone end of the lever 51, whereby to simultaneously move the arcuateplate valve 11 into an open position upon the opening movement of thevalve 46. The cam is provided' witha screw 58 for the purpose ofadjustment totake up wear occasioned by the It willy be apparent fromthe foregoing that v operation of the valve 46 will also cause. a slightopening movement ofthe arcuate plate 11 to allow sumcient air to passthrough the casmg for sucking the fuel through the openings 20, butstill providing a richer mixture than when the lever 40 is operated, thelatter being used for normal operating conditions after the motor hasbeen started. Upon releasing the choke lever 51 the same willautomatically close through the action of the spring 53.' l*

The lever 40 is operable independent of the valve lever 51, the formerserving to simultaneously open the needle valve 27 and the arcuate platevalve 11 to allow the vsuction of the engine to draw air and fuelthrough the casing in a predetermined ratio.

lf desired an idling valve 59` may be provided for the carburetor andsecured thereto in any Vsaid last named lever and said menace suitableposition to control the feeding of fuel through an aperture 60positioned in the wall of the carburetor beyond the valve 11.

Fuel is fed to the valve 59 by means of a feed pipe 6l. l

While I have disclosed a preferred embodiment of my invention it is tobe understood that varil ous changes may be made in the construction`with its face adjacent one edge in cooperating relation with said wallfor movement toward or away from the wall upon operation of the shaft,

a baille directing the path of air along said wall and a stop engageablewith ing movement thereof in one direction.

2. A carburetor comprising an open-ended casing attachable at one end toan engine manifold, the opposite end providing an-air intake, a fuelintake port in one Wall of the casing, a

fuel feed pipe connected thereto, a shaft journalled in the casing withits ends projecting outwardly thereof, a baille directing air passingthrough the casing along said wall, an arcuate plate carried by the`shaft and cooperating with said Wall to control the discharge of fueland air from the casing, a stop limiting movement of the plate 'when inclosed position, a lever attached to the shaft, a valve for the fuelpipe and an operative connection between the lever and the valve forsimultaneously operating the plate and the valve.

3. A carburetor comprising an open-ended casing, one end constituting anair `intake and the opposite end attachable to an engine manifold, afuel intake .port in one wall of the casing, a shaft revoluble in thecasing having its ends projecting therefrom, a valve carried by theshaft for controlling the passageof air and fuel through the casing, asecond fuel port beyond the valve, fuel feed pipes connected to each ofthe ports, valves for each pipe, an operating lever attached to one endof the shaft for said first named valve, anoperating connectionbetweensaid lever and the valve for said first named fuel port for thesimultaneous operation thereof, a lever for the valve of the secondnamed fuel port and an operating connection between shaft fo'rsimultaneously opening all `of the valves. 4. A carburetor comprising anopen-ended the plate for limit' lll@ casing, one end constituting anairintake and the opposite end attachable to an engine manifold, a fuelintake port in one wall of the casing, a shaft revoluble in the casinghaving its ends projecting therefrom, a valve carried by the shaft forcontrolling the passage of air and fuel through the casing, asecond-fuel port beyond the valve, 'fuel feed pipesconnected to each ofthe ports, valves for each pipe, an operating lever attached to one endof the shaft for said rst named valve, an operating connection betweensaid lever and the valve for said first named fuel port for thesimultaneous operation thereof, a. lever for the valve of the secondnamed fuel portl and an operating connection between said last namedlever and said shaft fory simultaneously opening all of the valves andspring means for closing the valve for said -last named fuel portindependent of the closing of said other valves.

5. A carburetor comprising a hollow casing forming an air passage andhaving a plurality of rows of openings in one wall, a plate secured tosaid wall having fuel passages communicating with the respective rows ofopenings, fuel,

feed pipes connected to said fuel passages, individual valves for thefeed pipes and the air passage of the casing and means connecting thevalve of one feed pipe with the valve of the air passage forsimultaneous actuation.

6. A carburetor comprising a hollow casing form an air passage andhaving a plurality if F. BROGE.

